Sckew-wrench



L. 1D. GILMAN, on TROY, NEW YORK.

. `serusw-wmmCH.

" speeication of Letters Patent No. 12,590, dated March 27, 1855.

" `Totali whom t may concern.'

. Be it knownthatl, L. D.` GILMAN, of

Troy, in the county `of Rensselaer'and State of New York, have invented certain new and `useful 11m rovements in Constructing Adjustable Venches; `and l do hereby declare t that the following is afull, clear, and exact f `description of thesame, reference being had to the annexed drawings, making apart of this specification, j in which- .j Figurel is a sectional view of the wrench "and Fig. 12`is a sectional view of a modificau t-ion of the arrangement shown in Fig. l, the

i same letters showing j j like parts in "each of the figures.

"The nature of my invention, and that f which distinguishes it from other improvements `heretofore made `1n j adjustable wrenches, j, consists in holding the adjustable jaw iirmly, whenrset` in position for use, by

` i means of rack teethlonthe shank of the adi justable jawf;` "and an adjustable toothed position.`

plate,whose teeth aremade to catch or lock `into the `teeth ot the shank of the adjustable j aw. The wrench being adjustedA and set :tor use, by `means ofan` eccentric or cam motion whichjactin "upon a strap of the toothed adjustable p ate, causes its: teeth to `catch or lock `,with the shank teeth, thereby holdingthe jaw of the wrench firm in its set The construction is as follows, viz: Alis the stationary jawand handle of the wrench, made hollow,` in` order to receive the 1 shankB of the adjustable jaw C,.one side of this shank is `formed with a rack of teeth j D is anadjustable toothedplate,i its `teeth teeth (a a). This plateis placed in a slot formed in the wrench handle, and has a vertical, or a motion at right angles to that of the jaw shank, its teeth are brought into gear with the teeth of the adjustable shank by means of an eccentric, or cam E, arranged on the opposite side of the Wrench handle; this cam has itseccentric bearings (c) attached to a loop or strap F secured to the adjustable plate, so that by reversing the handle of the eccentric, as shown by the dotted lines, in Fig. 1, the strap, by the eccentric motion is brought up, and with it the adjustable plate so as to lock its teeth into those of the shank, thereby holding the shank jaw lirmly in its set position while the wrench is` in use.

() matching with and locking into the rack G, G, arcguide bars, orguiding the ad- Y justable plate, and also serve as bearings for the springs (CZ el) which unlock the toothed plate quickly. (e) is a stop in the end of the shank to prevent the same from slipping out` of the handle.

I make no claim to the teeth on the sliding bar of the wrench. But

What I doclaim as new and desire to secure by Letters Patent, is-

The arrangement of the adjustable toothed plate with its springs, the toothed shank of the adjustable jaw, and the eccentric with its strap attached to the toothed plate, the

several parts being operated inthe manner and shown.

as herein fully described L. D. GILMAN.

Witnesses:

` J. J.` SAVAGE,

` WELLS. 

